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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45bcdeef9d00ea3fdba4a936d1f2e6dd332b1d07b870502f02169c61bc32d7f6' 
  AND token = 'pRQeb2Bc44kznmp5Lxi/0U4VX0+bwxQphrc++pr7alE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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