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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7b3a7142836d238c5484833381ea98eaa237653254388eaf08b5181c22d7723' 
  AND token = 'Ngaz7E4z5L8FZQ0RwIur7rASxQ4rVK6ErwzTNDcC+Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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