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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56f65ec2a1664532be0145c2eb95b2a1a1e76008f9241f85d77a793ace63977' 
  AND token = 'ulV2wA+hza0un9I6im06eH7gD66VDDvKYdJT2OTrHi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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