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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b45f77ea627aa55ae9422f95c5cf5d2c325691b6168dd2493fec44cff6042da0' 
  AND token = 'wbHoTNaSfIi4f9JlScr0lZ+x8bA0XRg+D9s4ZY5qtTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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