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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa1855f64ed0d2afd82a7fceb8660e0117d6f9a8b8845c633d1cb6558ac7cbff' 
  AND token = 'Yw57WcgRB94k7ScqnYwxoOKOpi7JEsR5rAJS5WzKhOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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