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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '853270dd06acbb7a0cdd63b21142ddf98585ccf961fb60ca96a26fe6e3346f8b' 
  AND token = 'gJedSrfGl47IimMsiy4L+VE4SfLT9+6XNGyHfPO5Nqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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