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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '885a2a783698463066d8960381015b2aceb3a929cfef7aebadc331be8b1b3eae' 
  AND token = 'ZIx651akqRq1eepg2zuEcySenHZN4rTqCVcdrDVTB2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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