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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34e85308d0b360be77dfd8e699deec3f3eadb103d87a9a8e5ae9a248c7dfeaa9' 
  AND token = 'CO296VcGqIH0CASPH3BH6mnNwa7MlKT7pCDDMNm8x7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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