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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b6f6321abfae78e984e7bcc3b3bd4421046630b4b3e38d7be1942a772b11b6e' 
  AND token = '4ImDCKN2efCukjYDD6WfLBOVkgTYVO7Zajqd4RKfHkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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