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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a30dad04c1e9582a830dc5aa7a1c2bd96edf0b62c0cce9ee7ba63b767ebbb1a7' 
  AND token = 'ygMPw1Nx7+DACwb1qg0b/v/Q3/Ud7ANzmqBfRRb6DZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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