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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe5c6c9b5af751a0d8dfe5b26474c5e67dc870e7cccd73ac06fceb1065540b83' 
  AND token = 'jEw0+0VdlWtBpJitFegovHfjCn15k5v+QEDumu0TQxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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