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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '124fa781d011da9d5480db2da046e4f42fa18d1a0342d13d422bc038f79a196f' 
  AND token = 'lKeVIbgA9Lzr166/5/aw+oe/LfrLetQdA0IvY/HJkSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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