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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fdc3728c108c562411af5a288a84c880f7e4838dd0126aae975548786aa0c76' 
  AND token = 'FI+5tV0LvVrIX9Qis4NtXW2zEZFiSR3H+oefty38Gbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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