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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '748c366a264b885750643fc4acc34843c1aa54eee7c01811e136cbb1023f6e01' 
  AND token = 'cxlc+gDXNJvIxfzysuofzVnPA8VQMOpsDExJZ1pcA8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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