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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9ec280c8dae801efdf1e6b688aa88777b232d4a8c6e63aea54a7e7089f159d7' 
  AND token = 'ymR/yine50f8brIwVUsIn9aZFxkAG09IRwvrcHUuabU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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