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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29273c9c5fa2f6331861620eb4370241642a46471f2e9f007e5e17f1c8481d37' 
  AND token = 'Pbr5lffxzYyzj9B0TV37m0t08zq3/e0iLJh3IzTVBkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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