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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95d06763ca35bb9061b41569b37998481b16f79791211df9a9410844836698ee' 
  AND token = '+6VN8ligk1e5vBt5ZPGvbYPPJWAQmrQThRPNRleEUcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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