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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cf712828da91f6110ce38e740dd4f211c58fc0d578bb096096303bf7767d423' 
  AND token = 'iku0xdN+MOhmvFxTQ6fnxlc2Q5LPAlntBmTkG3QoNHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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