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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17916ba5bd90bde10ed40a9b9c7147d4adcb266bef9091ab2b5e816a5eb7e265' 
  AND token = 'mP0JZ8/uv9dtX8rtzbV1Gj2XBBrbL9MhRcdDegHQCI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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