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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34dfd03d220b996386115d135ed8a05a296f952c3f50fa4963bc38b4e3aef3ba' 
  AND token = 'ReHxwZfScGssePldQEN7Q54xzLzVpBEi8QXvDe9+UCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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