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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0d47a86b31feadcb76c65fd720aec820efd3f3e7e79c20d4330527c30396fc9' 
  AND token = 'H2MrFwgLn+4PNoE69O7x9iQyV03b8oO1/4Q8gh6dXzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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