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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f995940ccc1e8747341201ac5cc77163fae6cce5aefd814095c73ceb6781c2bd' 
  AND token = 'GMavBFEma98+JgDdb5QJn/zBG2OT5BQEYHEaHqd0X9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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