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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca326df8274c42debaac1b00406e92da039c790d5879c8a4ee277a234dbf6a18' 
  AND token = 'AmSkvnAKG5rCzC+2x6L0pE0JgKqe3JMrqOeQRKzlFIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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