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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '319a1f6179243162347763d460d9f2afb653f27aef761175ed3718612f3dd1a9' 
  AND token = 'f3VJeHzS8EGu9+FhqlTrxFel0ajAuSj28VAr0ULEyB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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