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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ca54a82929192f232a111cee2fc3bbd22fab9bbe6588c3d9816babd782b8ae0' 
  AND token = 'DBkm2eC6/ksQWcGTsrYTu7X+uHT024fBWsIOZnuADys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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