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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd39e3de2a17145918cbbf0a51396fd1c9a016cb983420c6ec47267619d1cd5c8' 
  AND token = 'JM8WoVicCgEmcpVJeH73bdR9w6k/cD6j4CyxY+0harw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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