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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12865111f93e5c68f43dcda30e2955cf23efc8615573fc20b3bcd4629deff2bd' 
  AND token = 'THIc8Tdu1m2iA3NpTXiLaRUgozQDsnoWchezGEFN3II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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