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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e581526b47917e3475a89e2c97cb849a08b26ae733fcd97e63fcf4c03d6d848' 
  AND token = 'cWMV4CT2aM5VoYb37qARYchNRcWO9f7wpptkWZjCd/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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