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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '880752d0b28b4c36d5ceeb653e11fc0100e1a00a3f7b584baf7a004b134ee99b' 
  AND token = 'PYxdINSysZDde15sEZ7eZWu+VTqphgEdyoaYf9sQwQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}