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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40f992fb3e5d87d75ffaad90075b78f5246cb531701e5e665987d820d358a998' 
  AND token = '40TLF8nMUn6RW+SgL7nayk0ON0fgyxusmk0z7VPsZUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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