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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fdc7832e4f5fbbc5498eb364d6e03558e81feae9bdde2d779d3a416df541e38' 
  AND token = 'MznaGQNqoSzy2fuhNAjoyS42LbA3Uj2GlKxvmG0aoeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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