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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4afa4c3d1bdf74768afa0c0069e36ff607f9f2438c733ea70211472cafadb783' 
  AND token = 'OUlJGT7lL8Asb1wvT2Xe3M8WoV3Pbq+V3YI3DJhgTNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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