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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b0d90f885827d3ba88c583a5b2479abd8a73d3491722baf0f22930cb962ec4f' 
  AND token = 'bd8GgS3mdIIMYl0cOSXWTz9lDXyEdlthQHyE0WNnKIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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