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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae8dc8db141df3a3b8aa8eed7ec3d516453d287e7685108ce0ccc1c18de9b800' 
  AND token = '27LCh/u5EMi6At7biwZJC2THftu9JiCPa6+ndwsKesE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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