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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee00298f765dce56248283b93612d3e1a2e53eb4debaa08924801c51bc382d90' 
  AND token = 'KiQjgRRlYfO0eN/t50dbMLSrcoIfdVn1H7rv+NMfdxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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