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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '374c848400b0e0313bbf6133657a713ae88fe481361f00ce1038b94c2bdc4d0b' 
  AND token = 'F4N2VMp1CREXWXUjvpgp4x6MgANWiZtXu+HDogL57L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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