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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70b4d08c0aa6401566d9a1cbdcd6e8216138ef9a9978c24d1a3ec47e6529cd71' 
  AND token = 'HWeXuTYCz6tRePI+K39hID8ZO12PxCo7hOhySjvU2Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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