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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '155308ebf95f68495f1816f62e8e13c28f20d234e3b1668096c5f18b34b22f0f' 
  AND token = '2QAP+PXYxp8pyBGpdESLp2HMxhsoHbHG1z38JG1gFa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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