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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58c196cc4ad2eec99c4254e1931f7ae768215fb12d0afe9b6160a0811ef36f8c' 
  AND token = 'tqeQ2k077aJxeTQ/S77+Jviz2EOqKX97q6KpYb7KANs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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