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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eef394cc767454d653425c0edbf056cdd281d767986d6eff7b3ff3eedcb0eedb' 
  AND token = '/zs+o24aKIltbIXhjAYo+Pkx9ca9W/TZsAOrfLYxl/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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