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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '040a3e8d38e97073f7e778b3bb236deecb028e7c184e371c07c5039bd6aadf47' 
  AND token = 'DP8T+YDKA9BX9A1bFsKRQY0XrzkAsaMANvTojQqRKwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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