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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a699576492962870b94df1e3261e63d8410a62a86b67e907132d25e12d18a37e' 
  AND token = '9DpOHM86PkPQqiJLRJJkok+AQi7f7snn0u1XNIPtkf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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