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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dc3b115cfef18e7b572d8d95096ac5741c34150bc70ce0774766c6809b67562' 
  AND token = 'Ed/w4dlRgdhDrsJIQtUZgGF5ypn0iV+PPVfiVaUukaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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