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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77129b5185e8a4c9ef412c1c1dc9e504b983371ccda68bf67dfeb30905b78aea' 
  AND token = 'oufH9CnQ5oZZKmC6W2kK9ALauPClxPn302zIMsJRP0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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