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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e723da4cdd515ecdbe11653b1806fc9231cd71eebdbf1029ed7c6bd8fa7645ee' 
  AND token = 'UL4VtOjH1KWxanSF27YvSqiKV8lawMIY7Nili6EED/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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