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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '816c78328eb0ba9bacb1ec5540ec05e37517ad257b4964acd7f3793b7ca82df3' 
  AND token = 'Jel3UKMNwjU4sRL9WdalGZR6Qt1vEw0lGua/BrdyMpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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