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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46099e1d50132cb8e0f1ac8dce1a39be1fff4f9c8125ed49c2d1ba5d4712e4e5' 
  AND token = '2cuc3aJ7ryA+zPZ4MwPWwtBncmch8U8lssINFMw7Ogg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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