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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3447e75f01e36635abbe9cdf0b03da591c0950c95f5b98f2632caed9e94d98e' 
  AND token = 'cTpj1pU+X+t2EpXykRYP4O3xAz8PDKDjkYwSMr7Sq5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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