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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b9a40e2c27a7bab1113db07dd45c4ae08db452f673eb025086b7c627d78802e' 
  AND token = 'vl4ca9y8TSflVVi4DXt3ItbEh2s0Gny4KDY1zKKC8Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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