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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f4f5b45e67e73cb8be7ed4f8d61590ab24e57cd710cc50534277ba07b8ccd47' 
  AND token = 'rSq9eszrRU/Qd8DjWixCeF1mLJ2iBjcMHQ93QMdY7ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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