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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec3548d5cf1231056debc370a9c473f3f5d3b1efc2225c738d4d1e4bc10d035e' 
  AND token = 'TANtnRRJHQewo2iFokfBmgKEcpviNbqrymxDVJwu+sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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