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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbed372dc38b171f96fdebf636a5132a5d3e1d21d9de4f82149334027791c3be' 
  AND token = 'x4fkNtGq+Tjvx6MAi4VLyIfcj69I72T2LJi1aRVTxaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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