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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '442d16ab1880a6c2cc4b2eab7aa104e8155ca516db6a16784a2d349f736299ad' 
  AND token = 'qIsUl7S0bqJV+/Nh3q3p0tj1In+USlingerXqz7VKPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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