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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1f8c575700c6e55e3005e339821edb9238db1e306c503d494b856bfc91c25ae' 
  AND token = '//k0jLFwrckCy3SyheRD9JByPyKDaGCTWpOESPH8CHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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